Dust-barrier box.



J, s. GRASTY L w. s. lRODIMN. DUST BARRIER Box.

APPLICATION FJL'ED 06122?, 1915.

1,198,535. Pmemsepf. 19,1916.

. Maputo/3 mw M M2M@ /gm a W www pairs/ii srarns rarsirr JOHN SHARSEALL GRASTY AND 'WALTER SHELDON RODM'AN', 0F 'UNIVERSETY,

VIRGINA. l

DUST-BARRIER BOX.

Boxes,- of 4which the following is a specilication;

In another application filed of eif'en date herewith, We havedisclosed a. method of, and

apparatus for preventing the propagation of mine explosions by launching into the passage to be protected inert dust, and in prolonging the period during which this action. takes place, so that the dust will be thrown into the passage not all at once, but

during an interval, and, by proper construction of the apparatus employed this interi-'al may be varied. Thus, by initiating thedischarge of the dust by a thermostatic element located at a. distance from the (lust projecting meansl the dust may be projected into the passage if desired in advance of the pioneering wave, and the launching action prolonged to subsist as long as desired, or until the explosion Wave has passed.

This application relates to means whereby the period during which the dust is launched may be prolonged and the embodiment of such means shown herein comprises a pln rality 'of dust receptacles, and means 'for emptying in Ythe same, so constructed that the times at which thy several compartments will be employed differ. ln the speciiic forni shown this is effected by the 'simultane' ons release of the bottom oi the several com partinents, and by so restricting the discharge orifice of one or more of the coinpartments, that the flow of dust therefrom vwill be' retarded in inte, and thus prolonged in time.

Our invention therefore consists of a structure embodying the features above named, and inthe combination. construction and arrangcment'oi' the parts otwhich it may lie composed', as will be hereinafter iinlly l described and claimed.

Specification of Letters Patent.

Patentedsept, iS, i916.

Application filed 0ctobeo2'", 1915. Serial No. 58,292.

tudinal section the1'eol`,and Fig. l is a plan 'view of the same.

in Fig. 1 is shown a mine passage having mounted in the upper portion thereof near the roof, the dust receptacle B, and havingat a point remote from the receptacle, an

actuator (j. shown in the form oi a fusiblel strip forming a part of a circuit in which is a'current source l), and thc coilsV of a magnet E, the specific arrangement being such that upon such a rise oit' temperature7 adjacent to the actuator C, as would be due to an explosion in the vicinity thereof7l the continuity oit' the circuit will be broken and the magnet E dencrgiaed.

The receptacle l is shown as comprising three dust-receiving compartments oi' ap- )roaiiinatel the saine size. namehr b. 7X2 b3,

. J 7 f i these compartments-being separated i"roni` each other by the downwardly diverging longitudinal partition Walls. The side Walls ,f2 and f or" the receptacle converge downwardly,` and thus forni with the partition walls'a restricted opening or throat at the bottom or" each of the outer compartments b and b3, while the central compartment b2 is on the contrary wider'at the bottom than at the top.

The hinged bottom leaves g normally close the bottoms of all the compart-A ments, and are retained in this position by the catches H, hinged at it? and having their longer arms restrained `,from movement due to the Weight oi' th tom leaves f/ by ic shorter arms of horizontal levers l hinged at There is 'a catch li and a lever Y lach end the comparti at ment, and the longer end of each lever l is connected by a rod li with. a polepiece L co. acting with the nia "not there thus a. pole piece at each and ot' the magnet. With this construction of the parte, it will be seen that the coui'mrtinents are lilled with inert puiverizedIniaterial, and the circuit be broken, as at the actuator' C, the magnet E will be come denergizcd. releasing the pole pieces li. The Weight on the leaves 5'/ will then be able, it' the nti-lies be properly shaped, to thi-ou' out such catches, and the leaves will drop. instantly precipitating: the contents oi' compartment IP into the passage. ,ily u proper location oi' the actuator e lust resting on the botnience to feed at the same time. hut owing to the restricted mouth through which such (lust must be t'ed, the diachargrc ol! the dust from such connmrtments will he prolonged, and may he caused. h y a construction, to continue as lon.;r as desirable.

This application is tiled to contain claims on one ot' the several cmhodinicnts ot a ln'oad invention shown in our pri l)r application filed otl even date' herewith Serial No. 55,293', and failure to maxe certain claims herein should not therel'ore he unlerstood' as an alaindomuent thereol' as tht same are made in such prior applicz'ltion. `Yor do we in this application claim an mehod shown herein as the .same t'ornis the suhject-matter f our other application tiled. as a division of aforesaid application ot' even date. on ifiay i3, Ulli, Si". No. 07.2571).

Having thus (.lescrihcd ouf,y in\'ention,

Vwhat we claim and desire to sicure lily Letters Patent is,-

l. rl'he comlnnation with a pluralityy ot' dust containers, means 'for permitting the discharge of the contents thereof,` an aetnator therefor controlled by the occurrence ot' an explosion, and means for .prolonging the time of discharge of certaii. 't' such eontaincrs in respect to another ot' such containers.

The combination with a plurality of dust containers with meant) for simultaneousl)y permitting,r the com:uenceluent ot' the discharge thercot", one ot' auch containers heine* retarded in ital time of discharge, in respect to another otl such' containers.

El. The combination with a dust container adapted when opened to effect a rapid discharge of its contents, ot5 a dust container adapted when opened to eit'ect a retarded discharge ot its contents, and lnanS tor simultaneouslyv openingl the dust containera.

lu te timony whereof we hereunto sign our names.

JOHN SIIARSIIALL GHAS'IY. UJTIIR SIlllliDON RODMAN. 

